4.11 Handling system faults
If the room temperature exceeds or drops below the measuring range, i.e. above
49 °C or below 0 °C, the limiting temperatures blink, e.g., 0 °C or 49 °C .
In addition, the heating output is activated if the current setpoint is not set to Off,
the thermostat is in heating mode and the temperature is below 0 °C.
For all other cases, no output is activated.
The thermostat resumes Comfort mode as soon as the temperature is within the
measuring range.
● If the built-in temperature or humidity sensor fails and no external temperature
sensor is connected, fault message Er1 is displayed on the thermostat. If
EEPROM is damaged, fault message Er2 is displayed on the thermostat.
Replace the thermostat to measure the room temperature.
● If the external / remote temperature sensor fails and no external sensor is
connected, if input X1/X2/U1 is configured as AI except room temp external
sensor/return (AI), fault message Er3, Er4 or Er5 is displayed on the
thermostat. Check related sensor input terminals.
For fault status messages on the bus, see Fault and alarms function on KNX
[➙ 125].
4.12 KNX communications
RDG2..KN thermostats support communications as per KNX specifications.
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